MAX931ESA Equivalent & Substitute Parts

Part Overview

The MAX931ESA is a comparator with integrated voltage reference manufactured by Analog Devices Inc./Maxim Integrated. This linear IC operates as a single-element comparator with CMOS and TTL output capability in an 8-SOIC surface mount package. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	MAX931ESA
Manufacturer	Analog Devices Inc./Maxim Integrated
Product Category	Linear - Comparator with Voltage Reference
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Number of Elements	1
Output Type	CMOS, TTL
Voltage - Supply, Single/Dual (±)	2.5V ~ 11V, ±1.25V ~ 5.5V
Voltage - Input Offset (Max)	10mV @ 5V
Current - Quiescent (Max)	4µA
CMRR, PSRR (Typ)	80dB CMRR, 80dB PSRR
Propagation Delay (Max)	12µs
Hysteresis	50mV
Operating Temperature	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the MAX931ESA is determined by the following critical parameters:

Primary Compatibility Criteria:

Package type: 8-SOIC surface mount form factor
Output configuration: CMOS and TTL compatible outputs
Functional type: Comparator with integrated voltage reference
Single element count
Supply voltage range overlap: minimum 2.5V operation capability
Operating temperature range: -40°C to 85°C minimum

Secondary Compatibility Criteria:

Input offset voltage: maximum 12mV @ 5V
Quiescent current: maximum 4.4µA
Propagation delay: maximum 60µs
Hysteresis: 50mV nominal
RoHS3 compliance and MSL Level 1 rating

Substitute parts are grouped into two categories: direct equivalents (identical specifications and packaging) and functional alternatives (compatible electrical performance within specified tolerances).

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Output Type	Supply Voltage (±)	Input Offset (Max)	Quiescent Current (Max)	Propagation Delay (Max)	Hysteresis	Operating Temp	Packaging Type
MAX931ESA	Analog Devices/Maxim	Obsolete	8-SOIC	CMOS, TTL	2.5V~11V, ±1.25V~5.5V	10mV @ 5V	4µA	12µs	50mV	-40°C ~ 85°C	Tube
MAX931ESA+	Analog Devices/Maxim	Active	8-SOIC	CMOS, TTL	2.5V~11V, ±1.25V~5.5V	10mV @ 5V	4µA	12µs	50mV	-40°C ~ 85°C	Tube
LMP7300MA/NOPB	Texas Instruments	Active	8-SOIC	CMOS, Open-Collector, TTL	2.7V~12V, ±1.35V~6V	0.75mV @ 5V	13µA	15µs	1mV	-40°C ~ 125°C	Tube
LMP7300MAX/NOPB	Texas Instruments	Active	8-SOIC	CMOS, Open-Collector, TTL	2.7V~12V, ±1.35V~6V	0.75mV @ 5V	13µA	15µs	1mV	-40°C ~ 125°C	Tape & Reel
LTC1440CS8#PBF	Analog Devices	Active	8-SOIC	CMOS, TTL	2V~11V, ±1V~5.5V	10mV @ 5V	4.4µA	15µs	50mV	0°C ~ 70°C	Tube
LTC1440CS8#TRPBF	Analog Devices	Active	8-SOIC	CMOS, TTL	2V~11V, ±1V~5.5V	10mV @ 5V	4.4µA	15µs	50mV	0°C ~ 70°C	Tape & Reel
LTC1440IS8#PBF	Analog Devices	Active	8-SOIC	CMOS, TTL	2V~11V, ±1V~5.5V	10mV @ 5V	4.4µA	15µs	50mV	-40°C ~ 85°C	Tube
LTC1440IS8#TRPBF	Analog Devices	Active	8-SOIC	CMOS, TTL	2V~11V, ±1V~5.5V	10mV @ 5V	4.4µA	15µs	50mV	-40°C ~ 85°C	Tape & Reel
LTC1540CS8#PBF	Analog Devices	Active	8-SOIC	CMOS, TTL	2V~11V, ±1V~5.5V	12mV @ 5V	680nA	60µs	50mV	0°C ~ 70°C	Tube
LTC1540CS8#TRPBF	Analog Devices	Active	8-SOIC	CMOS, TTL	2V~11V, ±1V~5.5V	12mV @ 5V	680nA	60µs	50mV	0°C ~ 70°C	Tape & Reel
LTC1540IS8#PBF	Analog Devices	Active	8-SOIC	CMOS, TTL	2V~11V, ±1V~5.5V	12mV @ 5V	710nA	60µs	50mV	-40°C ~ 85°C	Tube

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute): MAX931ESA+ is the active production equivalent of the obsolete MAX931ESA. Both parts share identical electrical specifications, package configuration, and operating parameters. This part maintains full compatibility with existing designs and is ROHS3 compliant with MSL Level 1 rating.

Active Substitutes for Extended Temperature Range: LTC1440IS8#PBF and LTC1440IS8#TRPBF maintain the -40°C to 85°C operating temperature range of the original MAX931ESA while offering active product status. These parts are functionally compatible with identical input offset voltage (10mV @ 5V), hysteresis (50mV), and output configuration. Propagation delay increases to 15µs. Available in both tube and tape & reel packaging.

Low-Power Alternative: LTC1540IS8#PBF provides the lowest quiescent current (710nA) among active substitutes while maintaining -40°C to 85°C operation. Input offset voltage increases to 12mV @ 5V and propagation delay extends to 60µs. This option is suitable for power-sensitive applications where the extended delay is acceptable.

Enhanced Performance Alternative: LMP7300MA/NOPB and LMP7300MAX/NOPB (Texas Instruments) offer superior input offset voltage (0.75mV @ 5V) and extended operating temperature to 125°C. These parts feature open-collector output in addition to CMOS and TTL compatibility. CMRR and PSRR specifications improve to 100dB. Quiescent current increases to 13µA and hysteresis reduces to 1mV.

All substitute parts maintain 8-SOIC package compatibility, ROHS3 compliance, and MSL Level 1 rating.

Frequently Asked Questions (FAQ)

Q: Can MAX931ESA+ be used as a direct replacement for MAX931ESA? A: Yes. MAX931ESA+ is the active production equivalent with identical electrical specifications, package, and operating parameters. The only difference is product status (active vs. obsolete) and packaging format availability.

Q: What is the primary reason to substitute the MAX931ESA? A: The MAX931ESA is classified as obsolete. Substitution ensures long-term component availability and supply chain continuity. MAX931ESA+ provides identical performance with active production status.

Q: Are LTC1440 and LTC1540 series parts compatible with MAX931ESA designs? A: LTC1440 and LTC1540 parts are functionally compatible within the 8-SOIC package and maintain CMOS/TTL output configuration. Key differences include propagation delay (15µs for LTC1440, 60µs for LTC1540) and quiescent current specifications. LTC1440 series matches the 12µs propagation delay more closely.

Q: What is the difference between LTC1440CS8 and LTC1440IS8? A: The primary difference is operating temperature range. LTC1440CS8 operates 0°C to 70°C, while LTC1440IS8 extends to -40°C to 85°C, matching the original MAX931ESA temperature specification.

Q: Can I use LMP7300 series parts as substitutes? A: LMP7300MA/NOPB and LMP7300MAX/NOPB are functionally compatible alternatives offering improved input offset voltage (0.75mV vs. 10mV) and extended temperature range to 125°C. These parts include open-collector output capability in addition to CMOS/TTL outputs. Hysteresis is reduced to 1mV and quiescent current increases to 13µA.

Q: What packaging options are available for substitute parts? A: Substitute parts are available in tube packaging and tape & reel (TR) packaging. Tube packaging is suitable for lower-volume applications, while tape & reel is standard for automated assembly and higher-volume production.

Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity) rating, consistent with the original MAX931ESA specifications.

Q: Which substitute offers the lowest power consumption? A: LTC1540IS8#PBF provides the lowest quiescent current at 710nA. This part is suitable for battery-powered or power-constrained applications where the extended 60µs propagation delay is acceptable.

Q: What is the impact of propagation delay differences on circuit design? A: The original MAX931ESA specifies 12µs maximum propagation delay. LTC1440 series maintains 15µs, while LTC1540 series extends to 60µs. Applications requiring fast response times should prioritize LTC1440 or MAX931ESA+ to minimize delay-related performance degradation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message